Just documenting what I just found today while I was in at the dealership getting my headrest replaced that also had a leather failure. Unfortunately, I didn't notice this failure until today so not covered.
Mileage: 58,000
Year/Model: 2015/228i
Rear Seat Usage: 5 times total by a normal-sized human
Location: New Jersey
Parking Conditions: 50/50 outside and garaged
Upkeep: Routinely clean with leather cleaner/treat with conditioner
Pic: